However, its role as a nucleobase in RNA was not established until the 1940s, when the structure of DNA and RNA was elucidated. The discovery of uracil and its pairing with adenine in RNA was a ...

In this type of pairing, adenine (A) forms two hydrogen bonds with thymine (T) in DNA or uracil (U) in RNA, while guanine (G) forms three hydrogen bonds with cytosine (C). These base pairs are highly ...